研究生成SQL脚本
IF OBJECT_ID('DataAsInsCommand') IS NOT NULL DROP PROC DataAsInsCommand
GO
SET QUOTED_IDENTIFIER OFF
GO
CREATE PROC DataAsInsCommand (
@TableList varchar (200))
AS
SET NOCOUNT ON
DECLARE @position int, @exec_str varchar (2000), @TableName varchar (30)
DECLARE @name varchar(128), @xtype int, @status tinyint, @IsIdentity tinyint
SELECT @TableList = @TableList + ','
SELECT @IsIdentity = 0
SELECT @position = PATINDEX('%,%', @TableList)
WHILE (@position <> 0)
BEGIN
SELECT @TableName = SUBSTRING(@TableList, 1, @position - 1)
SELECT @TableList = STUFF(@TableList, 1, PATINDEX('%,%', @TableList), '')
SELECT @position = PATINDEX('%,%', @TableList)
相关文档：
1 防止sql注入式攻击(可用于UI层控制） #region 防止sql注入式攻击(可用于UI层控制）
2
3 /**/ ///
4 /// 判断字符串中是否有SQL攻击代码
5 ///
6 /// 传入用户提交数据
7 /// ......
基于msdn 详细学习T-SQL (http://msdn.microsoft.com/zh-cn/library/bb510741.aspx)
Aggregate function--Sum() Two Sample from msdn
USE AdventureWorks;
GO
SELECT Color, SUM(ListPrice), SUM(StandardCost)
from Production.Product
WHERE Color IS NOT NULL
AND ListPrice != 0.00 ......
Five basic search conditions are summarized here:
1) Comparison test
2) Range test
3) Set membership test
4) Pattern matching test (Like)
The pattern matching test checks to see whether the data value in a column matches a specified pattern
% mathes any se ......
这两天研究了SQL SERVER的字段修改.有一些心得,写出来为日后参考:
1,删除字段: ALTER TABLE [tablename] DROP COLUMN [fieldname]
删除的时候该字段必须没有被任何外键引用,没有任何约束.
2,删除约束: ALTER TABLE [tablename] DROP CONSTRAINT constraint_name
删除约束是约束名不可加单引号.
3,增加默认值约束: ALT ......
FileStream:文件流,为了解决大对象BLOB(Binary Large Objects)的存储问题.对于大对象存储,并且不受2GB的限制.
以往有两种方式:
(1)存储在数据库里面,这种方式一般使用image字段,或者varbinary(max)来做,好处是可以统一备份,但实际效率较低;
(2)存储在文件系统,而数据库中存储文件路径,这种方式数据库压力减轻了,但却不方 ......
